Caster



FIG. 1 is a top perspective view of a caster, showing my new design.

FIG. 2 is a bottom perspective view thereof.

FIG. 3 is a front elevational view thereof.

FIG. 4 is a rear elevational view thereof.

FIG. 5 is a right side elevational view thereof.

FIG. 6 is a left side elevational view thereof.

FIG. 7 is a top plan view thereof; and,

FIG. 8 is a bottom plan view thereof.

The broken lines in the figures show portions of the caster that form no part of the claimed design. 

CLAIM The ornamental design for a caster, as shown and described. 